Finally, when you stays at the tournament's page. There's a green button which says: Join tournament!

最后，当你停留在比赛页面时，将有一个绿色的按钮，上边写着，加入比赛Join Tournament ！

youdao

It's no use egging him on; he's made up his mind not to join in the tournament.

他已拿定主意不参加比赛了，你再将他也没有用。

《新英汉大辞典》

Should I invite Adam to join our tennis tournament?

我是否该邀请亚当参加我们的网球锦标赛？

youdao

But since that disappointing performance, Syracuse (28-9) has gone on a run, winning five of its last six games to reach the Big East tournament final and join Indiana (29-6), No. 2 Miami and No. 3 Marquette to form the only group of 1-4 seeds left in any NCAA region this year.

WSJ: No Florida Gulf Coasts: Top 4 seeds in East Region

Japan became the first team to join hosts South Africa in the tournament when they beat Uzbekistan 1-0.

BBC: Netherlands seal World Cup place

Nasri, 21, made two appearances for his country in their failed Euro 2008 campaign, announcing after the tournament that he was to join the Premier League side.

CNN: Frenchman Nasri completes Arsenal move